I was able to find more details about Agnihotra Homa which helps in purification of surroundings, cleansing of air and elimination of bacteria, viruses etc. As one answer says there are lot of incorrect videos and blogs describing Agnihotra , so I went looking for an answer in scriptures and found some information in Asvalayana Grihya Sutra
From Adhyaya 1 , Kandika 2
To the deities of the Agnihotra, to Soma Vanaspati, to Agni and Soma, to Indra and Agni, to Heaven and Earth, to Dhanvantari, to Indra, to the Viśve devās, to Brahman.
The deities of the Agnihotra are Sûrya, Agni, and Pragâpati.
Materials required as per Adhyaya 1, Kandika 3
11. Now wherever he intends to perform a sacrifice, let him besmear (with cowdung) a surface of the dimension at least of an arrow on each side; let him draw six lines thereon, one turned to the north, to the west (of the spot on which the fire is to be placed); two (lines) turned to the east, at the two different ends (of the line mentioned first); three (lines) in the middle (of those two); let him sprinkle that (place with water), establish the (sacred) fire (thereon), put (two or three pieces of fuel) on it, wipe (the ground) round (the fire), strew (grass) round (it), to the east, to the south, to the west, to the north, ending (each time) in the north. Then (follows) silently the sprinkling (of water) round (the fire).
- With two (Kuśa blades used as) strainers the purifying of the Ājya (is done).
3. Having taken two Kuśa blades with unbroken tops, which do not bear a young shoot in them, of the measure of a span, at their two ends with his thumbs and fourth fingers, with his hands turned with the inside upwards, he purifies (the Ājya, from the west) to the east, with (the words), 'By the impulse of Savitṛ I purify thee with this uninjured purifier, with the rays of the good sun'—once with this formula, twice silently.
4. The strewing (of grass) round (the fire) may be done or not done in the Ājya offerings.
5. So also the two Ājya portions (may optionally be sacrificed) in the Pākayajñas.
6. And the (assistance of a) Brahman (is optional), except at the sacrifice to Dhanvantari and at the sacrifice of the spit-ox (offered to Rudra).
7. Let him sacrifice with (the words), 'To such and such a deity svāhā!'
- If there is no rule (as to the deities to whom the sacrifice belongs, they are) Agni, Indra, Prajāpati, the Viśve devās, Brahman.
Assistance of a Brahmin is optional when it comes to Agnihotra. From Adhyaya 1, Kandika 3
And the (assistance of a) Brahman (is optional), except at the sacrifice to Dhanvantari and at the sacrifice of the spit-ox (offered to Rudra).
It is to be done twice a day - around sunrise and sunset. From Adhyaya 1 Kandika 9
4. The time for setting it in a blaze and for sacrificing in it has been explained by (the rules given with regard to) the Agnihotra,
5. And the sacrificial food, except meat.
But if he likes he may (perform the sacrifice) with rice, barley, or sesamum.
He should sacrifice in the evening with (the formula), 'To Agni svāhā!' in the morning with (the formula), 'To Sūrya svāhā!' Silently the second (oblations) both times.
And Adhyaya 1 and Kandika 10
4. And the deities (to whom those oblations belong), with the exception of the Upāṃśuyāja (offerings at which the formulas are repeated with low voice), and of Indra and Mahendra.
- Other deities (may be worshipped) according to the wishes (which the sacrificer connects with his offerings).
So from above what I could gather is that in morning mantra is for Surya and Prajapati, and evening for Agni and Prajapati.
And more details on where to sit during the homa, and mantras during oblations is in Kandika 10